Well I finally have the rotary working using the U axis instead of connecting and disconnecting the Y axis cable and dealing with changing the parameters back and forth.

I started this a year ago wanting to upgrade to Lightburn but it did not work with Lasercut and my Leetro MPC6535. So to fix that I bought a Ruida RDC6445G controller.

Got that wired up and working. Then I got Lightburn and I noticed people asking if it was possible to utilize the U axis in the Ruida. Well Marco Wong got together with ruida and they made a firmware patch that makes this all possible. RDC6445G-V15.01.22-LIB.upd

So I bought another Leadshine microstep driver, wired it in, put in a 4 pin connector for the rotary. Enabled the U axis in the Ruida and Lightburn and done.

So all I have to do to switch between the U and Y is check a box in Lightburn or RDworks. Set the origin over the top of your work.